HYDRODYNAMIC INSTABILITY IN THE COLD-CORE LOW AREA AND ITS EFFECT ON THE WEATHER
Journal Title: Український гідрометеорологічний журнал - Year 2017, Vol 20, Issue 20
Abstract
Cold-core lows are poorly understood cyclones, but they significantly impact on the formation of weather conditions in Ukraine, especially in its central and western regions. In the paper, the evolution of a cold-core low, which is associated with the enlargement of rain-fall areas with thunderstorms over the Western Europe and Ukraine. The low formed on July 21tst, 2014, in a deep cold trough of a Rossby wave over Atlantic Europe. During period 21-24 July the low was moving to the East and there were precipitation zones under its eastern part. Therefore, sizes of precipitation zones cannot always be explained by impact of front and thermic instability, in this paper it is tried to assess hydrodynamic instability in forming of precipitation in a cold-core low. The research method is based on the use of the linear theory of the hydrodynamic instability of the zonal flow with Rossby waves. To investigate barotropic instability fields of meridional profiles of absolute vorticity. It is shown that flow in which the low moved was barotropic unstable. Using baroclinic instability cha-racteristics (Phillips’s criterion) Baroclinic zones were revealed in atmospheric fronts and in northern part of area in question. It has been shown that hydrodynamic instability, both barotropic and baroclinic, in the eastern part of the cold-core low leads to intensification of atmospheric processes on the fronts, which was revealed to strengthening of precipitation and in the enlargement of zones of their formation.
Authors and Affiliations
E. P. Shkolnyy
Keywords
Related Articles
- EP ID EP327551
- DOI -
- Views 86
- Downloads 0
Advantages of using the Harmonie atmospheric mesoscale model for simulating water dynamics in offshore area
The convection-permitting Harmonie model is considered as a modeling component of the atmosphere-sea system. The role of the atmospheric model in the system is to create upper boundary conditions for marine environment m...
Convective phenomena forecasting based on output data of numerical models available in the Hydrometeorological Centre of the Republic of Belarus
In the article you can read about the methods used for forecasting convective processes by means of output products of numerical models with various spatial resolution. It presents the methods for forecasting convective...
Simulation of regional climate models of total cloud fraction in Morocco for the period of 2020-2050
The Moroccan energy system is highly dependent on external energy markets. The use of solar energy is one of the most promising ways in the development of renewable energy sources. At the moment, there are several scenar...
Method of forecasting assessment of the maximum runoff characteristics of the Dnipro Basin's rivers in spring season
Introduction. In Ukraine, under the conditions of current climate variability, the water content of the rivers, including the period of spring flood, changes. Against the background of the general tendency of reduction o...
Impact of climat changes on agro-climatic indices of the vegetative period of main agricultural crops
Article in question investigates indicators of the moisture-temperature regime for the period of 1986 - 2005 (base period) and compares them to their expected changes calculated for different scenarios of climate change...